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Without doing any calculation find the numbers which are surely not perfect squares.

Q.2 Without doing any calculation, find the numbers which are surely not perfect squares.

(i) 153

(ii) 257

(iii) 408

(iv) 441

Answers (1)
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As we know the units place of a perfect square cannot be 2, 3, 7, and 8.

So 153,  257,  408 are surely not perfect squares.

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